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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fiscal 2021 Acquisitions
Revenues	$ 1,482,323,000	$ 1,267,280,000
Net income from continuing operations	$ 416,348,000	$ 33,351,000
EPS - Basic (in usd per share)	$ 9.06	$ 0.72
EPS - Diluted (in usd per share)	$ 8.69	$ 0.71
SEOmoz Acquisition
Revenues	$ 1,438,099,000	$ 1,207,910,000
Net income from continuing operations	$ 406,281,000	$ 29,382,000
EPS - Basic (in usd per share)	$ 8.84	$ 0.63
EPS - Diluted (in usd per share)	$ 8.48	$ 0.62
Fiscal 2020 Acquisitions
Revenues		$ 1,339,927,000	$ 1,306,479,000
Net income from continuing operations		$ 21,450,000	$ 11,773,000
EPS - Basic (in usd per share)		$ 0.46	$ 0.24
EPS - Diluted (in usd per share)		$ 0.45	$ 0.23
RetailMeNot, Inc.
Revenues		$ 1,308,731,000	$ 1,267,847,000
Net income from continuing operations		$ 23,395,000	$ 22,117,000
EPS - Basic (in usd per share)		$ 0.50	$ 0.46
EPS - Diluted (in usd per share)		$ 0.49	$ 0.44
Fiscal 2019 Acquisitions
Revenues			$ 1,152,542,000
Net income from continuing operations			$ 35,203,000
EPS - Basic (in usd per share)			$ 0.73
EPS - Diluted (in usd per share)			$ 0.71
Highwinds Capital, Inc. and Cloak Holdings, LLC
Revenues			$ 1,072,047,000
Net income from continuing operations			$ 43,345,000
EPS - Basic (in usd per share)			$ 0.90
EPS - Diluted (in usd per share)			$ 0.88
BabyCenter LLC.
Revenues			$ 1,080,644,000
Net income from continuing operations			$ 35,953,000
EPS - Basic (in usd per share)			$ 0.75
EPS - Diluted (in usd per share)			$ 0.73
Spiceworks, Inc.
Revenues			$ 1,089,648,000
Net income from continuing operations			$ 36,711,000
EPS - Basic (in usd per share)			$ 0.76
EPS - Diluted (in usd per share)			$ 0.74

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
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